Smith's wife, Karen Brown, is offering a $1,000 reward for information that leads to finding her husband. She also hired a private detective to help in the search.

"We really want him to come home. He's very frail and that's why we're very worried about him," Brown said.

After the former aerospace engineer and lifelong surfer suffered a stroke last year, he expressed thoughts about suicide and depression, family members told police.

Brown said the Silver Alert was helping her and her daughter stay positive that he would be found safe.

Anyone who sees Smith, his SUV or Love is asked to call the Marina Police Department at 831-884-1210.

Smith could be driving a white 2003 GMC Yukon with California license plate number 5DGK846. Love may be driving a blue 1996 Toyota Tacoma and may be traveling to the Shasta-Redding area to visit family.